2556629568 has 70 divisors (see below), whose sum is σ = 7578666326. Its totient is φ = 852208128.

The previous prime is 2556629567. The next prime is 2556629573. The reversal of 2556629568 is 8659266552.

2556629568 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 629 + 5 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1602561024 + 954068544 = 40032^2 + 30888^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556629563) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 241405 + ... + 251772.

Almost surely, 2^2556629568 is an apocalyptic number.

It is an amenable number.

2556629568 is an abundant number, since it is smaller than the sum of its proper divisors (5022036758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2556629568 is an equidigital number, since it uses as much as digits as its factorization.

2556629568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493201 (or 493182 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The square root of 2556629568 is about 50563.1245869952. The cubic root of 2556629568 is about 1367.3801439248.

The spelling of 2556629568 in words is "two billion, five hundred fifty-six million, six hundred twenty-nine thousand, five hundred sixty-eight".